Several JVM parameters that are commonly used

-xms	The amount of heap memory initially allocated by the JVM, which is 1/64 of physical memory by default.
-xmx	the maximum allocated heap memory size of the JVM, by default, is 1/4 of physical memory.
-xx:permsize	The amount of non-heap memory initially allocated by the JVM is 1/64 of the physical memory by default.
-xx:maxpermsize	The maximum allocated non-heap memory size of the JVM, which is 1/4 of physical memory by default.
-xx:newsize	the initial generation heap area memory size allocated by the JVM.
-xx:maxnewsize	the maximum allocated Cenozoic heap area memory size for the JVM.
-xx:reservedcodecachesize	the size of the cache space when compiling code.

For full JVM parameters, refer to the official documentation:
Http://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html

In the event of a memory overflow using eclipse, consider adding the following configuration, and the values can be adjusted appropriately.

Eclipse Menu Window->preferences->myeclipse Enterprise workbench->servers->tomcat 6.x->jdk-> Optional Java VM Arguments

-xms256m-xmx512m-xx:maxnewsize=256m-xx:maxpermsize=256m

Eclipse.ini of the Eclipse root directory

C:\Users\admin\AppData\Local\MyEclipse Professional 2014
-vmargs
-xmx768m
-xx:maxpermsize=320m
-xx:reservedcodecachesize=64m

Several JVM parameters that are commonly used